Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity
authors Karmaoui, M; Tobaldi, DM; Skapin, AS; Pullar, RC; Seabra, MP; Labrincha, JA; Amaral, VS
nationality International
journal RSC ADVANCES
keywords TIO2 THIN-FILM; TITANIUM-DIOXIDE; SURFACE-AREA; NANOCRYSTALLINE TIO2; METHYLENE-BLUE; WATER; NANOPARTICLES; DEGRADATION; PHASE; SEMICONDUCTOR
abstract A novel, facile method based on a non-aqueous sol-gel solvothermal process has been developed to synthesise spherical TiO2 nanoparticles (NPs) in one pot. The reaction between titanium(IV) tert-butoxide (Ti[OC(CH3)(3)](4)) and benzyl alcohol was a simple process, which resulted in the formation of highly crystalline titania NPs with a small size of only 6 nm, and with a correspondingly high surface area. The chemical formation mechanism of the metal oxide NPs has been proposed, and the degree of surface hydroxyls (-OH groups) has been examined. The products of the synthesis were characterised by X-ray powder diffraction (XRPD) using the advanced whole powder pattern modelling (WPPM) method, high-resolution transmission electron microscopy (HR-TEM), thermo-gravimetric analysis (TGA), UV-visible diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR) spectroscopy. The photocatalytic activity (PCA) was evaluated in both the liquid-solid phase, by monitoring the degradation of an organic dye (methylene blue (MB)) under UV-light irradiation, and in the gas-solid phase, by following the degradation of 2-propanol under UV and visible-light exposures. The synthesized titania powders not only exhibited excellent photocatalysis in the liquid-solid phase (under UV irradiation), but also possessed a superior PCA in the gas-solid phase under a visible-light exposure. The effects on the PCA of the very small crystalline domain size, surface composition and the presence of organic molecules due to the synthesis process of the TiO2 NPs were shown to account for this behaviour.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2014
volume 4
issue 87
beginning page 46762
ending page 46770
digital object identifier (doi) 10.1039/c4ra07214f
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000342761800049
  ciceco authors
  impact metrics
times cited (wos core): 8
journal impact factor (jcr 2016): 3.108
5 year journal impact factor (jcr 2016): 3.257
category normalized journal impact factor percentile (jcr 2016): 64.759
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